Graphene oxide was loaded onto ZnO disks with dominant polar facets and photo reduced to form ZnO-RGO photocatalysts. Their photocatalytic activity for methylene blue degradation is remarkably improved under UV-visible light irradiation. The enhanced activity is ascribed to the trapping effect of RGO for photoexcited electrons that inhibits electron/hole recombination and to the adsorption effect of RGO for methylene blue to increase its local concentration. The optimal loading of the RGO is ca. 2 mass%, above which light absorption by the RGO decreases the photo utilization efficiency.
; zhou li] nanchang univ, dept chem, nanchang 330031, peoples r china. [li feng] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china.
; wang, xw (reprint author), nanchang univ, dept chem, nanchang 330031, peoples r china.